Ultra short wave system



1 Ian. 7, 1941.

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ULTRA SHORT WAVE SYSTEH Flled July 27, 1940 2 Sheets-Shea?. 2

flarflft'll [Hlm CELL Ml'lF/ER Jan. 7, 1941.

aim m Q n C F Patented Jan. 7, 1941 e lf gj'. tion of V(lerrnarxy vThis invention is concerned with an arrangement adapted to receive eectrormgnetic waves,

especially ultra. short waves,cennmeter and milliw meter waves. 5` The invention is predicated upon a principle which bynovel waysand means is suited for the demodulation of electromagnetic waves mod- A ulated by signals. The principle is that metallic i chips of suitable shape distributed inside a space 1u are directionalized or oriented 'c2-'the incoming radio frequency eld, with the result that the passage and transmission oflght throughthe -space containing the partities isnfiuenced. The

. particles, however, must be protected against l5 gravity in thisspace in order to prevent them from settling all at the bottom. This end is 'attainable -by impressing them with a direct curf rent-voltage and by maintaining them in a state f oisuspension in a direct current electric eld.

- ".ef Instead ormai the particles come also be kept f insuspension inside a medium of suitable density onby the aid of 'a lamina e stream of a suitable "mcdium suchasar. l 1

'.-f @1i/'According tov the purpose and practical use (whether 'for telegraphy on any desired waves at g period yof the particles .will be demanded in f order thatthey may follow variations of radio frequency amplitude. Mor-cova, the particles 3U should not adjust themselves in an oscillatory ""fway by action of `the signal or incoming eld: :in fact the'damping effect. of the medium or ambient must'be so chosen that theadjustment proceeds in the aperiodic case. Once Y 35) a particle has become sette' adjted, and if the incoming field is equal to zero, then. the particles "will be restored .again to their most probable receiiringrpositoi by such static, hydrodynamic Vor Brownian forces as may prevail sithin the e medium or ambient.. In order that this may be f accomplished inside a correspondingly brief periocl of time, the particles must be of suitable Smailness. 1 Metallic chips or fragments or splinters of .45 high-conducting material or an insulator with a 'i high dielectric constant are used for the reason that the particles are devoid of natural or ine i herent electrical moment and that, indeed, they become dipoles only when immersed in a radio 5 0 frequency field by virtue of inuence cil'ect. In other words, the electrical moment of Vsuch n splinteris a. function of m incoming or signal eld intensity. Y i -The following descn'bes a number of etwaige 5 5 ments adapted to carry the basic idea of in y UNITED s'm'ies4 ULTRA SHORT WAVE SYSTEM Wilhelm Runge, Hans Otto Roosenstein. and Werner Fogy, Berlin, Germany, assignors to Telefunken Gesellschaft fr Drahtlose Tele- I graphic xn. b. H., Berlin. Germany, a corporaall, broadcast, television, etc), a lower adjusting .PATENT carica Ansmann .my 27, 1940, serial N 347,832

ff In Germany February 17, 1939 s claims. (steso-21) vention into practice. The'exemplied embodiments to be described are 4divided according to the form of the particles and the means and the manner of eliminating the action of gravity upon the particles.

In the drawings, Figs. 1a and 12: and 5 illus trate shapes of particles which can be used in the practice of the invention: Figs. 2a and 2b are given to aid in an understanding of the basic principles involved; Figs. 3, 4 and 6 ilustrate dif- 1 ferent embodiments ofthe invention: and Fig. 7 is a side View of the embodiment of Fig. 6.

If the particles have the shape of oblong crystais (Fig. 1), then these rodlets will have their longitudinal axis directed or directionalized in 15 the sense of the eld. To calculate the problem. the assumption shall be made that the dimensions a and b (or d for round rcdlets) are very small in contrast to the length L.

Referring to Fig. 2, (a) illustrates the distribu- 2o tion of the particles in the absence of a. signal or incoming veld. Between the plates Pi and P2 Vthe particles in some convenient manner have been caused to assume positions parallel to the 'planes of the plates. If, then, a radio frequency 25 field is applied tothe plates P1 and P2. or if rays or radiations of suitable polarity be transmitted between the plates, the assembly of particles assumes a state as shown in Fig. 2b: in other words,

the particles assume positions at right angles 3o with an incidental reduction of the light ray pencil S. The angle of rotation of the particles is a function of the intensity of the radio frequency field.

Pigs. 3 and 4 illustrate two din'erent arrange- 3 ments according to the invention.' Referring to Fig. 3, it-will beseen that l is a fan or blower, 2 o. device adapted to produce a laminate air current, 2a. a. flne mesh sieve, 3 the circuit means for the light-source, and 4 the light source. The ar- 40 rows 5 indicate the laminate form of the air current, 6 the particles. I the' envelope of cylindrical form consisting of insulation material, 8 are the electrodes. 9 the reflector particles forming a grate, l the condensing lens, ll the photo-elec- 45 trio cell, i2 the amplier, I3 the indicator device and i4 the antenna circuit. The particles' float in a gas current of laminate or sheet form. The f light source is attached below to a sieve, and the light-rays are reilected from the tiny mirrors S into the lens I0 in such away that they fall upon 5"" a. photoeelectric celi and au indicator device; su.

a loud-smeken a telephone receiver or a telc graphic instrument.

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In an arrangement of kind shown in Fig. 4, 55 1 'ne'. "unsern-1m- Mw! the cylinder is placed in a horizontal position and the particles are heid in a state ot suspension within a medium of suitable density and viscosity. The reference numerals in Fig. 4 are as follows: l5 is the insulation ease, i8 thc electrodes. l1 the particles. i8 the condensing lens, I9 the source of light, 20 the medium in which the particles are caused to float. 2l the photo-electric cell including amplifier and indicator device, and 22 stands for the antenna circuit.

If the particles are in the form of foliations. or scales (as illustrated in Pig. 5) so that two of their dimensions are large compared with the third, it will be readily understood that a single field direction is inadequate to direct or adjust the particles so that they assume a clearly defined position. The demand is that the particle innfde a radio frequency eid should have its plane placed at right angles tothe light ray penu'l, thoughin practice innumerable other positions may occur. In order t-o prevent this it is necessary to cause another field to actat right angles to the field El.. the said additional field being indicated at Ez and being of the same intensity. Thusif both elds are allowed to act at the same time in full intensitythere results again only one tiel-d direction, namely. the resultant of E1 and Ez, ,and therefore only one acting force. The fields El and E2, therefore, should not act simultaneously,

but they must be sli-fted or be apart a period f and a phase angle equal tof/2. Period f must be small in contrast to the time of adjustment T of the particles, and the inertia of the particles must be suitably chosen lest the particles rotate in the rotary electric field of El and E2. Howeverw it the inertia, the clamping and period -r are properly attuned. the particles will be unable to partake of the rotation; indeed, they be compelled to have their two ,particular or characteristic direc- '40 tions adjusted to the maior plane given and governed by the two directions of the elds.. II

the light flux is allowed to impinge normally to this major plane, a certain part of the light'mll be blocked. Fig. 6 shows schematically an ar 'I 45 rangement by which this condition is obtainable..

' Referring to Fig. 6. 23 is the antenna, 24 the medium or ambient,.25 the particles. 25 and 2l the pairs of electrodes. 28 the phase and transit time loop, 29 the resistance. 30 the space capac- 'A 60 ities, 3 I the light source, 32 the condensing lenses, `33 the photo-electric cell, amplifier and indicator.

The radio frequency rotary eld is setup by tiro pairs of electrodes which are fed so that there results a certain suitable phase displacement angie. Each plate" pair has at its end a.v space capacity. As to the rest, the arrangement is thev .same as that in Fig. 4.

Fpndamentally speaking, it ls possible also to ce signal field 'for such directionalizing purposes,

' magnetic in nature.

" 1jk'n.155 the incoming field intensity. The particles. of

course, must be opaque to light, while the medium or vambient must be permeable to light. In order that no disturbing diffraction effects may happen.

the wavelength of the transmitted light must be 'zo seien in contrast mui the dimensions of the,

` particles.

. Instead o! a radio frequency rotary neld for the adjustment of the laminate or foliate particles 2,228,0e4 i y thereto. However, in this ,instance a. biasing po. tcntial must be impressed on the particles.

The invention is not conned to the exemplied embodiments herein shown, indeed it resides essentially in this fact that variations of radio frequency amplitude of an incoming or signal eld are converted into light variations by causing the signal :field to act upon minute particl and to impose upon these particles an orientation in space which differs from the position of equllibrium of the particles. The nature oi the particles as well as the particular form of arrangement is immaterial so far' as' the said broad and general idea underlying the invention is concerned. The

' size of the particles may be as small as down to molecular dimensions.' v

What is claimed is:

1. In an ultra short wave system, a container having uniformly suspended therein in a light permeable medium a multiplicity of minute orientable particles of high dielectric constant, a source of light at4 one end of said container for emitting rays of light which impinge upon said medium, a utilization circuit at the other end of said container for receiving the light rays passing through sad medium. a pair of spaced electrades intermediate the ends of said container and substantially on opposite sides of said medium, and means for applying radio frequency signal energy to said electrodes for aecting the orientation of said particles.

2. In an ultra. short wave system, a container having uniformly suspended therein in a. light permeable medium a multiplicity of minute orientable particles of high dielectric constant, a source of light at one end of said container for emitting rays of light which impinge upon said medium, a utilization circuit at the other end of said container for receiving the light rays passing through said medium, a pair of spaced electrodes intermediate the ends of sa'ld container and substantially on opposite sides of said medium, means for applying radio frequency signal energy to said electrodes for effecting the orientations of said particles. and means for maintaining said particles in a state of suspen- -sion in said medium.

"i 3` In an ultra short wave system. a container having uniformly suspended therein in a light vpermeable medium a multiplicity of minute orithe magnetic component of the incoming or or scales, recourse couldbe had toa linear 15 rcid and a direct current cld at right angles entable opaque particles of asymmetric contour. a source or light at one end of said container for' emitting rays of light which impinge upon said medium, a utilization circuit at the other end of said container for receiving the light rays passing through said medium. a pair of spaced elect-rodes intermediate the ends oi said container and substantially on opposite sides of said medium. and means for applying radio frequency signal energy to said electrodes for aecting the orientation of said particles.

4. In an ultra short wave system. a container having uniformly suspended therein in a light permeable medium a `multiplicity of minute ori entaille opaque metallic particles of asymmetric contour, a source of light at one end of said oontainer for emitting rays of light which lmpinge upon said medium, a utilization,circuit at the other end of said container for receiving the light rays passing through said medium. a pair of spaced electrodes intermediate the ends of said container andsubstantially on -opposite sides of said medium. means for applying radio frequency signal 'energy to said electmdes for aieotlng ithe orientation ot said particles, and means includ gg A 2,225,064 3 ing a unidirectional 'eld for'maintaning said particles in a. state of suspension in sain medium.

5. In an ultra shortwave syszem, a container having uniformly suspended therein in a` light permeable medium a xnultpiicie; of minute orl-- entable rod-like opaque particles a source of light at one end of said container for emitting rays of light which impige upon said medium, a photoelectric cell in light coupling relation to the other end o said container for resetting the light rays passing through said medium. a pair oz' spaced electrodes inter-mediateA the ens of said `container and substantially on opposite sides of said medium, and means for applying radio frequency signal energy to said electrodes :'or affecting the orientation of said particles.

6. In au ultra Shortwave system, a container having a light permeable medium in which are suspended la multiplicity of minute orientable opaque particles of asymmetric contour, a source of light at one end of said contate: for emitting rays of light which impnge upon said medium,

a mirror at the other end of seid container for receiving the light rays passing through said medium, said mirror being arranged to reect the light lmpingng thereon at en angle to the longest dimensim of said container, means for.

applying a radio frequency tleld to said particles for altering the position thereof, e. photoelectric cell for receiving the light reilected from said mirror. an amplier coupled to s'aid photoelectric cell. and an indicator coupled to the out` put o! said amplifier, whereby the variations in intensity of the light impinging upon said cell serve to indicate the variations in said radio frequency field. l

'i'. In an ultra short wave system, a container having a light permeable medium in which are suspended a multiplicity of minute orientable opaque particles of asymmetric contour, a source of light at one end oi said container for emitting rays of light which impinge upon said medium, means for applying a radio frequency eld to said particles for altering the position thereof, a photoeiectric cell in light coupling relation to the other end oi said container, an amplier coupled to said -photoelectric cell. and an indicator coupled to the output of said amplifier, whereby the variations in intensity of the light impinging' upon said cell serve to indicate the variations inV said radio frequency field,

WILHELM RUNGE. A HANS OTI'O ROOSENSI'EIN. WERNER FOGY. 

